John Siracusa has written epic reviews of OS X since Developer Preview 2 in 1999. They are a fantastic resource, offering in-depth analysis of the interesting bits.

Let’s take a quick look at how each review links to itself and to previous versions. I’m only using links in the review body and excluding the page navigation and other extra links. While we could make some flashy plots, I channelled Edward Tufte and just left it as a table of numbers.

	Link Target
	10.9	10.8	10.7	10.6	10.5	10.4	10.3	10.2	10.1	10.0	DP4	DP3	GUI	DP2	Total
10.9	23	33	30	13	14	12	3	3	3	4	0	0	0	0	138
10.8		21	62	19	16	8	3	1	1	1	0	1	0	0	133
10.7			40	20	27	17	3	4	1	2	2	2	0	0	118
10.6				51	54	15	6	1	2	4	0	0	0	0	133
10.5					32	33	5	4	1	2	0	0	0	1	78
10.4						13	9	1	0	4	0	0	0	0	27
10.3							9	15	4	3	0	0	1	0	32
10.2								10	12	4	2	0	0	0	28
10.1									35	32	0	0	0	0	67
10.0										26	3	2	2	2	35
DP4											13	9	4	3	29
DP3												5	1	0	6
GUI													2	5	7
DP2														0	0

The 10.9 Mavericks review has the most internal links, 138, but that is fairly similar to the last four reviews. It references the older reviews back to 10.0 Cheetah but leaves off the Developer Previews.

My thanks to John for writing the reviews, and Ars Technica for maintaining the archive of the previous reviews.